Went back down to the Upper East Side ("UES") again and did E 73rd St. through E 86th St; about 14 miles.
The composition of this section of the neighborhood was very similar to the streets I covered in my previous UES post, which has some of the historical info on the neighborhood. The one notable difference was that instead of hospitals and related medical facilities, the blocks east of 1st Ave / 2nd Ave. were mostly residential.
Interesting Fact: I'd always assumed that York Ave. (the avenue east of 1st. Ave that corresponds w/Ave. A south of 14th St.) was named either for Old (English) York, like Amsterdam Ave. on the west side, or for the Yorkville neighborhood, which it runs through. Turns out neither is the case. Instead, York Ave. was named for Sgt. Alvin York, a heavily decorated soldier from WWI best known for receiving the Medal of Honor after leading an attack on a German machine gun nest. Well, I thought it was interesting.